There is a hole on 3 sides of the wooden box, and the clear container on the side screws to the 4th side. The bees go into the holes, crawl through tunnels, and then end up into the container. They can't get out once they get in. No chemicals involved.
When the container fills up, you simply unscrew the container, and empty out the dead bees. As you can see, the traps work. Placing them in areas up at the underside of the barn roof, where the wind doesn't blow it too much, the bees eventually find it. I had two traps up, and put up 3 more.
Hubby has since found a man who makes them locally. If I need more I can buy them from him now.